In windows Explorer you said that the disk can't be accessed; but can you see it there (in my computer)? and importantly does it have a drive letter attached to it?
If so you it may be possible to run a check disk on it. If so right click on it, go to properties / tools menu / Check now.
If not, there are a few approaches, I will list all I can think of: 1. Try to get it to read:
- Unplug the drive and reboot the PC
- Turn on the drive power to spin up the drive
- Listen to the drive, you'll hear it start, when it the sound peaks and it appears to be spinning at its fastest, plug in the USB cable.
- This is particularly useful if the drive or the more usually the hardware that attaches it to the usb port is a little faulty and slow to read to the drive. While it's still booting up windows finds the usb but can't read the drive and times out. This way the drive is already spinning at full speed and it can be read by the hardware (it's case) almost immediately. 2. If this fails
- Repeat the steps in different USB ports on your computer to rule out the port or the USB controller as an issue.
- Repeat the steps on another computer.
- Try to swap the USB cable 3. If it still this fails
- Consider sourcing a recovery program that can read RAW disks, this way you can recover your data regardless of a broken MBR or corrupt partition tables. There's many free ones about which I always go for first.
- Download free partitioning software such as partition wizard
to run a checkdisk on an uninitialized disk or a disk without a recognized partition structure
If at any stage you are able to read your disk, back everything up asap (i guess you know that though)
If you begin to play with partitioning software or disk manager in windows,it may be an idea to recover the data first with the recovery software so that the partition or MBR is not further damaged.
I wish you luck and if you would like any further clarification on terms or anything, please ask, we are here to help.